centos6 BCM4312 802.11b/g

$> uname -a
Linux Tiger-L 2.6.37 #2 SMP Thu Mar 3 22:45:04 IST 2011 i686 GNU/Linux
$> lspci | grep Broadcom
03:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g (rev 01)

download hybrid-portsrc_x86_32-v5_100_82_38.tar.gz

$> modprobe lib80211
$> lsmod | grep lib80211
lib80211                5058  0
insmod wl.ko
dmesg

http://wiki.centos.org/zh/HowTos/Laptops/Wireless/Broadcom
http://lists.kernelnewbies.org/pipermail/kernelnewbies/2011-March/001278.html